package org.apache.rocketmq.common.protocol.route;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Random;

import org.apache.rocketmq.common.MixAll;

/**
 * {
 *     "broker-a":{
 *         "brokerAddrs":{
 *             "0":"172.16.62.75:10911"
 *         },
 *         "brokerName":"broker-a",
 *         "cluster":"DefaultCluster"
 *     }
 * }
 */
public class BrokerData implements Comparable<BrokerData> {

    private String cluster;

    private String brokerName;

    // 同一个brokerName下可以有一个Master和多个Slave,所以brokerAddrs是一个集，brokerld=O表示 Master，大于 O表示从 Slave
    private HashMap<Long/* brokerId */, String/* broker address */> brokerAddrs;

    // 用于查找broker地址
    private final Random random = new Random();

    public BrokerData() {

    }

    public BrokerData(String cluster, String brokerName, HashMap<Long, String> brokerAddrs) {
        this.cluster = cluster;
        this.brokerName = brokerName;
        this.brokerAddrs = brokerAddrs;
    }

    public String selectBrokerAddr() {
        String addr = this.brokerAddrs.get(MixAll.MASTER_ID);
        if (addr == null) {
            List<String> addrs = new ArrayList<>(brokerAddrs.values());
            return addrs.get(random.nextInt(addrs.size()));
        }
        return addr;
    }

    public HashMap<Long, String> getBrokerAddrs() {
        return brokerAddrs;
    }

    public void setBrokerAddrs(HashMap<Long, String> brokerAddrs) {
        this.brokerAddrs = brokerAddrs;
    }

    public String getCluster() {
        return cluster;
    }

    public void setCluster(String cluster) {
        this.cluster = cluster;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((brokerAddrs == null) ? 0 : brokerAddrs.hashCode());
        result = prime * result + ((brokerName == null) ? 0 : brokerName.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        BrokerData other = (BrokerData) obj;
        if (brokerAddrs == null) {
            if (other.brokerAddrs != null)
                return false;
        } else if (!brokerAddrs.equals(other.brokerAddrs))
            return false;
        if (brokerName == null) {
            if (other.brokerName != null)
                return false;
        } else if (!brokerName.equals(other.brokerName))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "BrokerData [brokerName=" + brokerName + ", brokerAddrs=" + brokerAddrs + "]";
    }

    @Override
    public int compareTo(BrokerData o) {
        return this.brokerName.compareTo(o.getBrokerName());
    }

    public String getBrokerName() {
        return brokerName;
    }

    public void setBrokerName(String brokerName) {
        this.brokerName = brokerName;
    }
}
